Carriage-reversing mechanism.



B. D: JACKSON. CARRIAGE REVEBSING MECHANISM. APPLICATION FILED 11mm. 1912. RENEWED NOY.18,1913.

Patented June 23, 1914.

SHOT/mug riage' of the machine.

' rear of the BYRON D. JACKSON, 01: ERIE, PENNSYLVA OF ERIE, PENNSYLVANIA, A

NIA, ASSIGNOR To MODERN CORPORATION or PENNSYLVANIA.

TOOL COMPANY,

CARRIAGE-REVERSIN G MECHANISM.

Specification of Letters Patent.

Patented June 23', 1914.

Application filed November 7, 1912, 'Serial No. 730,099. Renewed November 18, 1913. Serial No. 801,743.

To all whom it may concern:

- Be it known that I, BYRON D. JAoKsoN, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania,- have.invented new and useful Improvements in Carriage-Reversing Mechanisms, of which the following is a specification.

This invention relates to carriage reversing mechanisms and consists in certain improvements in the construction thereof as will be hereinafter fully described and pointed out in the :claims.

More particularly the invention is designed for reversing the action of the carriage of a grinding machine, or similar tool, and as described it is so ada ted.

' The invention is illustrate in the accompanying drawings as follows:

Figure 1 shows a plan view of the reversing mechanism. Fig. 2 a section on the line 22 in Fig. 3. Fig.3 an enlarged view, partly in section, of the reversing clutch and gears.

1 marks the carriage, and 2 the frame of the machine. g

3 marks the gear which drives the car- As indicated in dotted lines this is accomplished through a worm, worm gear and rack but any well known device may be utilized for converting the movement of the gear 3 into a movement of the carriage, the purpose of the reversing mechanism forming part of this invention being to reverse the carriage so as to give to the carriage a reciprocating movement.

A gear 4 meshes the gear 3. It is journaled on a shaft 5. The hubof the gear 4 is provided with the detents 6 which engage the detents 7 on the sliding block 8. The sliding block 8 is in the form of a sleeve extending through the bearing 8 in the frame and terminates in a hand wheel 9. A clutch member 10 is arranged on the shaft 5. It is slidingly mounted on the shaft but locked against rotation thereon. It has the engaging lug 10? which engages a lug 11 on the gear 4. The block 8 has a groove 12 and the clutch member 10 has an annular groove 13. These grooves are engaged by the arms 14 and 15 respectively and these arms are carried by a sliding shaft 16, the shaft being slidingly mounted in the frame of, the machine. It will be readily observed 23 has the detents 25.

in. which case the lug 10 is out of the path of the lug l1 and the o eration may be accomplished by turning t e hand wheel. On the other hand, the hand wheel may be drawn to the intermediate position as shown 1n Fig. 1 where the lug is out-of engage? ment and the hand wheel also with the gear 4. By drawing the hand wheel outwardly to the full extent the lug 10 is thrown into the'path of the lug 11- and the gear is then driven by the machine. By making a single lug 10 so there is a complete turn of the shaft 5 with each reversing movement the parts are able to come fully to rest before being picked up on the reverse operation. In this way the shock of the reverse is reduced.

The carriage is driven through the drive wheel 17. This is fixed on a shaft 18. The shaft 18 operates in a bearing 18 extending from the bracket 18. A gear 19 is fixed on the inner end of the shaft 18. The gear 19 meshes a gear 20, the gear 20 being carried by a shaft (not shown), and the shaft journaled in the bearing 20. The gear 20 is fixed on the hub of a beveled gear 21. The beveled gear 21 meshes the gears 22 and 23 journaled on the shaft 5. The gears 22 and 23' therefore meshing the opposite sides of the gear 21 revolve in opposite directions. The gear 22 has the detents 24 and the gear A sliding clutch block 26 is arranged between the gears 22 and 23. The block is locked against rotation with the shaft by a spline 27. The clutch block is provided with the detents 28 operating in connection with the detents 24 and 25 so that when the clutch block is thrown into engagement with either the gear 22 or the gear 23 it is driven by the gear in which it is in engagement, the length of the clutch block being such as to throw it out of engagement with one gear prior to its engagement with the opposite gear. In other words, the clutch block when brought to an intermediate position is in engagement with neither gear. The clutch block has the annular groove 29 into which the pins 30 extend. The pins extend from the ends of the forked lever 31. The forked lever is pivoted on a pin 32,.the pin being carried by the walls of the bracket 18". The lever 31 has the extension 33 in position to be engaged by the arms 34 extendingfrom the actuating lever 35. The actuating lever 35 is pivotally mounted on the pin'32, the lever having an opening 36 extending through 1t through which actuating lever 35 is connected with the link ,37 by a pin 38 and to a rock lever 39 by a pin 40, the pin 40 extending through the slot 41 giving some play to the connection. The rock'lever 39 is arranged onthe reversing shaft 42. A reversing lever 43 extends from the reversing shaft and is in position to be engaged by the adjustable stops 44 on the carriage in the usual manner.

The arrow head cam 45 is carried by a plug 46. The plug extends into a socket 47 in the bracket 18 and is forced upwardly by a spring 48. The arrow point cam operates against a wheel 49 on the end of the actuating lever 35.

The operation of this mechanism is as followsz-As the carriage strikes the reversing lever thismovement is carried through the reversing lever, rock shaft 42, rock lever 39,

- link 37 to the actuating lever 35. The arms 34 are so spaced as to give an initial movement to the-actuating lever 35. After the actuating lever has been moved some distance one of the arms 34 is brought into engagement with the extension 33 and with a continued movement the clutch block is forced out of engagement with the gear withwhich it is then in engagement. It will be observed that as the clutch block is forced out -of engagement it is free to move forward or in the direction toward which it is being forced because the arms 34 are so spaced as to permit of a relative movement of the extension 33 between the arms. This slightv spring of the parts as the clutch block is disengaged from one set of detents throws it by reason of its momentum along the shaft into engagement with the opposite set of detents, thus bringing the extension for the moment away from the driving arm 34. The play between the arms and the extension 3 is suflicient to permit of this transfer so that when the block has been thrown into engagement with the opposite gear 22 or 23 it brings the extension into contact with the arm 34 away from the driving arm. In.

order, however, to assure this action the arrow point cam is provided. The driving action of the carriage follows the actuating lever to a point bringing the roller 49 beyond the point of the cam and it then moves over the cam to assure a forward movement of the actuating lever through the impulse of'the spring 48 after the carriage has ceased to act by reason of the disengagement of the clutch block with the driving gear 22 or 23.

In order to permit of this forward movement of the actuating lever with the stoppage of the carriage some play must be allowed in the lever 31 extends. The

the connection between the reversing lever and the actuating lever and in the construction shown this is provided by means of the slot 41. It will be understood that the arrow point cam is more in the nature of a safety device than a necessity in the normal operation of the machine, as the momentum of the clutch block and the slight snap of .the parts as it is engaged from one gear 22 or 23 will carry it across the space into engagement with the opposing gear ordinarily without action or assistance of the arrow point cam and the spring 48.

What I claim as new is 1. In a carriage reversing mechanism, the combination of a carriage; a carriage driving shaft; oppositely driven opposing wheels on said shaft; a clutch member slidingly mounted on said shaft between said wheels but locked to rotate with said shaft; a throw lever for the clutch member; an actuating lever for communicating a movement of the carriage to the throw lever for actuating the throw lever, said actuating lever having a limited movement relatively to the throw lever to allow the throw lever and clutch member to advance after the disengagement with one wheel into engagement with the other wheel; and means actuated by the carriage for operating the actuating lever.

2. In a carriage reversing mechanism, the combination of a carriage; a carriage driving shaft; oppositely driven opposing wheels on said shaft; a clutch member slidingly mounted on said shaft between said wheels but locked to rotate with said shaft; a throw lever for the clutch member; an actuating lever for actuating the throw lever, said actuatin lever having arms extending each side 0 the throw lever but spaced therefrom to give to the actuating lever a limited movement relatively to the throw lever to allow,

the throw lever and clutch member to advance after the disengagement with one wheel into engagement with the other wheel; and means actuated from the carriage for operating the actuating lever.

3. In a carriage reversing mechanism, the combination of a carriage; a carriage drive shaft; oppositely driven opposing wheels on said shaft; a clutch member slidingly mount ed on said shaft between said wheels but locked to rotate with said shaft; a throw lever for the clutch member; an actuating lever for communicating a movement of the carriage to the throw lever for actuating the throw lever; an arrow point cam operating on the actuating lever to move the actuating lever after the disengagement of the clutch member; and a connection between the actuating lever and the carriage, said connection having intermediate parts having a limited relative movement to permit of the movement of the actuating lever through ;the influence of the arrow point cam.

lever for the clutch member; an actuating.

lever for actuating the throw lever; an arrow point camoperating'on the actuating lever to move the actuating lever after the disengagement of the clutch member; and a connection between the actuating lever and the carriage comprising a rock lever and link and pin connection to permit of a 11m-- ited movement of the actuating lever under the influence of the arrow point cam.

5. In a carriage reversing mechanism, the combination'of a carriage; a carria e drive shaft; oppositely driven opposing w eels on said shaft; a clutch member slidingly mounted on said shaft between said wheels but locked to rotate with said shaft; a throw lever for the clutch member; an actuating lever for actuating the throw lever, said actuating lever having a limited movement relatively to the throw lever to allow the throw lever and clutch member to advance after disengagement with one wheel into engagement with the other; means actuated from the carriage for operating the actuating lever; an arrow point cam operating on the actuating lever; a spring operating on the cam; and a connection between the carriage and the actuating lever, said connection having a limited play to permit of a movement of the actuatin lever after the stoppa e of the carriage t rough the influence o the arrow point cam.

In testimony whereof I have hereunto set my hand in the presence of two subscribing wltnesses.

BYRON D. JACKSON.

Witnesses:

B. M. HARTMAN, H. C. LORD. 

